IEEE C802.16m-09/1942r2
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Proposed Text for the IEEE 802.16m AWD on HARQ Feedback Region (15.3.6)
Date
Submitted
2009-09-02
Source(s)
Yujian Zhang, Yi Hsuan, Hujun Yin
Intel Corporation
+86-10-82611515
{yujian.zhang,yi.hsuan, hujun.yin}@intel.com
Hyunkyu Yu, Mihyun Lee
Samsung
Re:
Category: AWD comments / Area: Chapter 15.3.6 (DL-CTRL) & 15.3.9 (UL-CTRL)
“Comments on AWD 15.3.6 DL-CTRL & 15.3.9 (UL-CTRL)”
Abstract
Proposed text for HARQ Feedback Region in P802.16m Amendment Working Document
Purpose
To be discussed and adopted by TGm for the 802.16m amendment.
Notice
Release
Patent
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IEEE C802.16m-09/1942r2
Proposed Text for the IEEE 802.16m AWD on HARQ Feedback Region
(15.3.6)
Yujian Zhang, Yi Hsuan, Hujun Yin
Intel Corporation
Hyunkyu Yu, Mihyun Lee
Samsung
1. Introduction
Indexing for HF-A-MAP and HARQ Feedback Channel has been specified in IEEE P802.16m/D1. One
remaining issue is how to handle the situation that HARQ feedback channels in one subframe are associated
with transmissions from more than one subframes. In this contribution, the concept of HARQ Feedback Region
is introduced to handle the problem.
2. HARQ Feedback Region
When HARQ Feedback channels in one subframe are related to transmissions from more thane one subframes,
they need to be partitioned and current description of HARQ indexing in P802.16m/D1 can be applied to each
region individually. Such region is denoted as HARQ Feedback region in uplink and HF-A-MAP region in
downlink. In this contribution, we will use HARQ Feedback region as examples, but all the discussion are
applicable to HF-A-MAP region as well. An example is shown in Figure 1 below, for TDD DL:UL=5:3,
subframe #0 in UL carries HARQ Feedback Channels for DL subfame #0 and #1. So for UL subframe #0, we
define two HARQ Feedback regions, and apply indexing within each region.
Figure 1 HARQ Feedback Region
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IEEE C802.16m-09/1942r2
The number of HARQ Feedback regions for one particular subframe is only determined from D:U configuration,
and the selection of HARQ Feedback region is determined from the subframe index of the transmission. They
are not changed with regard to long TTI, or potentially different Rx processing times.
For TDD DL HARQ, refer to Table 725 of P802.16m/D1. For each UL subframe n, assume the indices of
associated starting DL subframes are the ordered set M  {m0 , m1 ,, mK 1} , where m0  m1    mK 1} , then
–
The number of HARQ Feedback regions is the size of M.
–
For each DL subframe mk, the index of the associated HARQ Feedback region is the order of mk in
set M.
An example for TDD D:U=5:3 is shown in Figure 2 below. UL subframe #0 are associated with DL subframes
#0 and #1. For all DL transmissions starting from DL subframe#0, associated feedback is located in HARQ
Feedback region 0. Similarly, for all DL transmissions starting from DL subframe#1, associated feedback is
located in HARQ Feedback region 1. The relationship does not change when long TTI is used or different
processing time is used.
Figure 2 Example for TDD D:U=5:3
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[
Start Text Proposal ---------------------------------------------------
------ Recommended AWD Text Proposal #1 (page 309, Line 50) ------]
There is one HF-A-MAP region in each DL subframe. Within each HF-A-MAP region, the index for HF-AMAP channel is calculated as follows.
For persistent allocation, HF-A-MAP resource index is specified in HFA of UL Individual Persistent A-MAP IE
or UL Composite Persistent A-MAP IE.
For group resource allocation, HF-A-MAP resource index for the l-th AMS in GRA allocation
is (istart  l * N HF  A MAP / N GRA ) mod N HF  A MAP , where istart is the ACK Channel Offset in UL group resource
allocation A-MAP IE, NHF-A-MAP is the total number of HF-A-MAP configured per HF-A-MAP region, and NGRA
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IEEE C802.16m-09/1942r2
is the Use Bit Map Size in UL group resource allocation A-MAP IE.
For resource allocation using UL basic assignment A-MAP, HF-A-MAP resource index is
( M ( j)  n) mod N HF  A MAP , where j is HF-A-MAP Index Parameter in Non-user specific A-MAP IE, n is HFA
in UL basic assignment A-MAP IE, NHF-A-MAP is the total number of HF-A-MAP configured per HF-A-MAP
region, M(j) is STID when j=0 and M(j) is lowest LRU index of corresponding UL transmission when j=1.
[
------ Recommended AWD Text Proposal #2 (page 412, Line 63) ------]
In FDD, there is one HARQ Feedback region in each UL subframe. In TDD, with notation in Table 725 in
<<15.3.9.2.2.2.1>>, for HARQ Feedback Channel in UL subframe n, the associated DL bursts can start from a
set of DL subframe indices denoted by M  {m0 , m1 ,, mK 1} , where m0  m1    mK 1} . The number of
HARQ Feedback regions is equal to the size of set M. For DL bursts starting at subframe mk, the index of the
associated HARQ Feedback region is the order of mk in set M, with index 0 corresponding to the 1st HARQ
Feedback region. Within each HARQ Feedback region, the index for HARQ Feedback Channel is calculated as
follows.
For persistent allocation, index k is specified in HFA of DL Individual Persistent A-MAP IE or DL Composite
Persistent A-MAP IE.
For group resource allocation, index k for the l-th AMS in GRA allocation is
(istart  l * LHFB / N GRA ) mod N HFB (istart  l * LHFB / NGRA ) mod LHFB , where istart is the ACK Channel Offset in
DL group resource allocation A-MAP IE, LHFB is the total number of HFBCH configured per HARQ feedback
region, and NGRA is the Use Bit Map Size in DL group resource allocation A-MAP IE.
For resource allocation using DL basic assignment A-MAP, index k is ( M ( j )  n) mod LHFB , where j is
HFBCH Index Parameter in Non-user specific A-MAP IE, n is HFA in DL basic assignment A-MAP IE, LHFB is
the total number of HFBCH configured per HARQ feedback region, M(j) is STID when j=0 and M(j) is lowest
LRU index of corresponding DL transmission when j=1.
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